1. Generating electricity ( GEOTHERMAL)
Describe how steam drives a turbine connected to a generator
Describe how naturally occurring steam can be used to drive turbines

2. Thermal power station block diagram
BOILER
TURBINES
GENERATOR
BOILER
Fuel is burnt to turn water into high pressure steam.
TURBINE
High pressure steam turns a turbine (like a windmill)
GENERATOR
The turbine rotates the coils of a generator to produce electricity.

6. Geothermal energy
In some volcanic areas hot water and steam rise to the surface. The steam can be tapped and used to drive turbines. This is known as geothermal energy.

7. Geothermal versus thermal power stations
ADVANTAGES
Renewable
No greenhouse gases
No acid rain
No radioactive waste
Short start up time
DISADVANTAGES
Very limited locations
Expensive to build